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    <title>Tests :nth-child(An+B) matching</title>
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    x { text-decoration: underline; }
    x { border-left-width: 1px; }
    x { border-right-width: 1px; }
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    x { border-bottom-width: 1px; }
    x { border-style: solid; }
    x { border-color: blue; }

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<div><x>x</x><y>x</y><y>x</y><x>x</x><y>x</y><y>x</y><x>x</x><y>x</y><y>x</y><x>x</x><y>x</y></div>

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